Definition of residual current device in English:

noun

He said the warning to immediately install the safety switch or residual current device came after the electrocution of a young mother and her child this month.

Fit a residual current device, RCDs can reduce the risk of electrocution by cutting the power supply if an electrical tool malfunctions or a cable is cut.

The regulations require that a residual current device installed at a workplace shall be kept in a safe working condition and tested on a regular basis by a competent person to ensure its continued effective operation.